Reversing mechanism for power operated drills



Oct.\2`2, 1946.v c. L. coNNER REVERSING 'MECHANISM FOR POWEROPERATED-DRILLS Filed 'Jan. 19, 1945 Patented Oct. 22, 1946 v2,409,738@V l I REVERSDIGMECHANISM ron Povvmt l oPERATED DRrLLs y LClarence L. Conner, McFarland, Calif.

Application January 19, 1945, Serial No. 573,497

2 Claims. 1

The present invention relates to new and useful improvements in poweroperated portable drills adapted primarily for utilizing the powertake-off of a tractor as the source of power and the invention has forits primary object to provide a novel drive connection for the drill andincluding reversing means adapted to be secured in either its forward orreverse driving position.

A further object of invention is to provide a friction drive connectionfor the drill yieldably held in friction driving engagement whereby toprevent injury to the drill and its drive connection should the drillencounter obstructions in the drilling operation.

A still further object is to provide a device of this character ofsimple and practical construction, which is'eilicient and reliable inoperation, relatively inexpensive to manufacture and otherwise welladapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawing forming part hereof, wherein likenumerals refer to like parts throughout and in which Figure 1 is avertical sectional view of the gear housing and shaft for the drill andFigure 2 is a sectional view taken substantially on a line 2-2 of Figure1.

Referring now to the drawing in detail wherein for the purpose ofillustration I have disclosed a preferred embodiment of the inventionthe numeral designates a shaft housing to the upper portion of which issecured a gear housing 6 which serves to close the top of the shafthousing. 'I'he bottom 'l of the gear housing is formed with a bearing 8in which the hub 9 of a ring gear In is journaled, the hub having asquare' shaped socket I I in which the square shaped upper end of ashaft I2 is secured for rotation of the shaft upon the operation of thering gear Ill.

The lower end of the shaft I2 is formed with a conicalsocket I3 in whichthe conical head I4 of a lower shaft section I5 is frictionally engaged,the shaft section I5 being journaled in a bearing I6 at the bottom ofthe housing 5 and extending downwardly therefrom for attaching to thedrill I1.

A pin I8 extends transversely of the upper portion of the shaft sectionI5 and a coil spring I9 is positioned'between the pin and the bushing I5to yieldably urge the friction head I4 into engagement with the socketI3 to provide a fric- 2 tional drive connection between the shaft I2 andthe shaft extension I5.

A horizontal shaft 20 is journaled in the opposite sides of the gearhousing 6 and to one end of which is secured a flexible shaft 2| adaptedfor attaching to suitable power driven means, such as the power take-offof a tractor or the like (not shown).

A sleeve 22 is slidably keyed on the shaft 20 within the gear housing 6,the sleeve having gears 23 and 24, secured on the opposite ends thereof'and adapted for selective engagement with diametrically opposite sidesof the ring gear II) whereby the engagement of one of said gears withthe ring gear will produce a rotation of the drill I1 in one directionwhile the engagement of the other of said gears with the ring gear willrotate the drill in an opposite direction.

An annular groove 25 is formed intermediate theends of the sleeve 22 andin which a semi-circular plate 26 is freely positioned, the plate havingastem 21 rising therefrom and provided with an annular flange 28 adaptedfor bearing against the underside of the cover plate 29 of the gearhousing, the cover plate having a longitudinally extending opening 3Utherein through which the stem projects into a position above the coverplate for threadedly receiving a clamping nut 3I.

The releasing of the nut 3| will permit the stem 21 to slidetransversely of the gear housing in the slot 3|! whereby to cause theselective engagement'of either the gear 23 or the gear 24 with the ringgear I0 and upon tightening the nut 3| the gears will be secured ineither their engaged or neutral position.

A carrying handle 32 is attached to the cove plate 29 'for the gearhousing by means of the arms 33.

In the operation of the device the gear 20 is driven by a suitablesource of power connected to the flexible shaft 2I and by sliding thesleeve 22 in either direction through the stem 21 and clamping nut 3|either of the gears 23 or 24 may be moved into engagement with the ringgear I0 to drive the drill I 'l in a designated or desired direction.Should the drill encounter an obstruction during the drilling action thefriction head I4 will slip in the friction socket I3 whereby to preventinjury to the mechanism.

It is believed the details of construction, manner of operation andadvantages of the device will be readily understood from the foregoingwithout further detailed explanation.

While the foregoing specification sets forth the invention in specificterms, it is to be understood right angle to the driven shaft, a sleeveslidably keyed to the driving shaft and having beve1 gears on the endsthereof spaced aparta distance Vless than the diameter of the toothedportion of 'the ring gear, said bevel gears being disposed for 4movement selectively into and out of meshing engagement with the ringgear, and actuating means rotatably connected to the sleeve and slidablyconnected to the housing for slidably moving the sleeve relatively tothe driving shaft; to move the bevel gears selectively into and out ofmeshing engagement with the ring gear.

2. -A power operated drill as in claim l, said actuating'rneansincludingclampingv means manually movable into and out of clampingengage- Ament with the housing for retaining the sleeve and bevel gearsin any of a plurality of positions with respect to the ring gear.

CLARENCE L. CONNER.

